Elaboration of forging conditions on the basis of the precipitation analysis of MX-type phases in microalloyed steels

• Autorzy: Opiela M. , Grajcar A.
• Języki publikacji: EN

Abstrakty

EN

The paper presents analysis of the precipitation of MX-type (M—microalloying element, X—interstitial element) phases in austenite of constructional steels microalloyed with Nb, Ti, V and B, assigned for production of forged elements with the use of thermo-mechanical treatment. The calculations were conducted basing on the dependence of solubility product of MX-type phases in austenite as a function of temperature. The analysis was done on the basis of a simplified thermodynamic model for equilibrium conditions, assuming that individual MX-type phases are soluble in austenite. The solubility of TiN, TiC and NbC as a function of temperature as well as the simplified temperature sequence of precipitation of these phases have been determined. The effect of austenitizing temperature in a range from 900 to 1200 °C on grain size of prior austenite was investigated to verify the analysis. A grain growth corresponds well with a course of a precipitation process, though the limitation of the current model arising from a lack of consideration of complex carbonitrides and the kinetics of a precipitation process should be taken into account. The studies provide the basis for proper design of manufacturing process of thermo-mechanical treatment for high strength forged elements of microalloyed steels.

Słowa kluczowe

EN

microalloyed steels; MX-type phases; prior austenite; thermomechanical treatment; forged elements

PL

stal mikrostopowa; elementy kute; rozpuszczalność

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2012
• Tom: Vol. 12, no. 4
• Strony: 427--435
• Opis fizyczny: Bibliogr. 26 poz., rys., tab., wykr.

Twórcy

autor

Opiela M.

• Silesian University of Technology, Konarskiego 18a, 44-100 Gliwice, Poland

autor

Grajcar A.

• Silesian University of Technology, Konarskiego 18a, 44-100 Gliwice, Poland

Bibliografia

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